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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 5 Months Ended 0 Months Ended 1 Months Ended
Feb. 28, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Maximum
Dec. 31, 2012
Maximum
Aug. 09, 2012
Equity Offering Program
Dec. 31, 2012
Equity Offering Program
Feb. 11, 2011
Public Offering
item
Mar. 31, 2011
Public Offering
Stockholders' Equity                    
Cash distributions declared per share of common stock (in dollars per share)   $ 1.34 $ 1.32 $ 1.23            
Discount rate (as a percent)   5.00%     5.00% 5.00%        
Common shares issued under the Distribution Reinvestment Plan   214,620 254,502 81,154            
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars)             $ 50,000,000      
Number of shares sold 2,700,000             120,844 2,700,000  
Proceeds from sale of shares   2,131,000 40,569,000         2,296,041 40,569,000  
Payment of commissions on sale of shares               23,000    
Payment of offering costs on sale of shares               165,000    
Number of mortgages to be repaid                 2  
Repayment of mortgages payable   32,422,000 15,302,000 10,689,000         7,700,000  
Weighted average interest rate (as a percent)                 7.90%  
Decrease in outstanding amount   34,550,000 44,700,000 19,500,000         26,200,000  
Payments made to purchase a property   $ 44,616,000 $ 28,000,000 $ 72,300,000           $ 2,325,000